"""华为昇腾芯片功耗采样后端（占位实现）"""

from __future__ import annotations
from typing import Optional
import subprocess

from .base import PowerBackend


class AscendBackend(PowerBackend):
    """华为昇腾芯片功耗采样（示例）"""
    
    @staticmethod
    def is_available() -> bool:
        # 检查昇腾驱动是否安装
        try:
            result = subprocess.run(['npu-smi', 'info'], 
                                    capture_output=True, timeout=2)
            return result.returncode == 0
        except:
            return False
    
    def init(self, device_id: int = 0) -> bool:
        # 初始化昇腾设备
        # import acl  # 昇腾计算库
        return False  # 占位实现
    
    def sample(self) -> Optional[float]:
        # 调用昇腾 API 获取功耗
        return None  # 占位实现
    
    def cleanup(self):
        pass
    
    def get_name(self) -> str:
        return "ascend"

